US10362573B2ActiveUtilityA1

Method and system for multi-protocol transmissions

85
Assignee: ERICSSON TELEFON AB L MPriority: Nov 27, 2015Filed: Dec 23, 2015Granted: Jul 23, 2019
Est. expiryNov 27, 2035(~9.4 yrs left)· nominal 20-yr term from priority
Inventors:Hassan HalabianAlfred SchmidtRoland A. Smith
H04L 5/003H04W 72/0453H04L 27/2602H04L 27/2607H04W 88/06H04L 27/2627H04L 27/2603H04L 27/26025
85
PatentIndex Score
6
Cited by
12
References
28
Claims

Abstract

Methods and systems for multi-protocol transmissions in shared spectrum are disclosed. According to principles described herein, a wireless transmitter is configured to generate subcarriers or symbol information from one OFDM technology using subcarriers of another OFDM technology. With this approach, a wireless transmitter configured to transmit OFDM symbols using subcarriers and a subcarrier frequency spacing associated with one OFDM protocol can also be configured to transmit OFDM symbols associated with another OFDM protocol which normally uses different subcarriers and a different subcarrier frequency spacing. In one application, an LTE transmitter uses LTE subcarriers to generate 802.11 (e.g. Wi-Fi) subcarrier or symbol information that can be understood by Wi-Fi receivers, for example to reserve the channel for a certain duration, to indicate a transmission time associated with an on-going and/or upcoming symbol transmission or to create a carrier sense indication, for example, to cause Wi-Fi receivers and other radio technologies to consider the channel as busy.

Claims

exact text as granted — not AI-modified
The invention claimed is: 
     
       1. A method for a wireless orthogonal frequency division multiplex, (OFDM) Long Term Evolution (LTE) transmitter configured for transmission of a first set of OFDM symbols using a base plurality of subcarriers having a base subcarrier frequency spacing defining a base symbol duration, the method comprising:
 transmitting, using the base plurality of subcarriers, a second set of OFDM symbols during one base symbol duration, each of the second set of OFDM symbols including a second Cyclic Prefix (CP) and having a second symbol duration smaller than the one base symbol duration, the first set of OFDM symbols being associated with a first radio access technology (RAT) having a first physical layer and the second set of OFDM symbols being associated with a second RAT having a second physical layer different from the first physical layer, the transmitting of the second set of OFDM signals being based on a predetermined set of modulation values for the base plurality of subcarriers, the predetermined set of modulation values corresponding to data associated with the second RAT; and 
 the transmitting of the second set of OFDM signals including applying M Long Term Evolution, LTE, modulation values in the LTE transmitter to an M-point inverse fast Fourier transform, IFFT, to generate a Wi-Fi transmission recoverable at a Wi-Fi receiver by an N-point fast Fourier transform, FFT. 
 
     
     
       2. The method of  claim 1  further comprising transmitting, using the base plurality of subcarriers, a first set of OFDM symbols, each of the first set of OFDM symbols including a base CP and having a base symbol duration. 
     
     
       3. The method of  claim 2  wherein the first and second sets of OFDM symbols are transmitted in sequence, as one of contiguous transmissions and non-contiguous transmissions. 
     
     
       4. The method of  claim 3  wherein the first and second sets of OFDM symbols are transmitted as non-contiguous transmissions separated by a delay and wherein the second set of OFDM symbols comprises data is indicative of a time for completing transmission of the first set of OFDM symbols. 
     
     
       5. The method of  claim 1  further comprising transmitting, using the base plurality of subcarriers, a third set of OFDM symbols during one base symbol duration, each of the third set of OFDM symbols including a third CP and having a third symbol duration smaller than the base symbol duration. 
     
     
       6. The method of  claim 1  wherein the first RAT is LTE and the second RAT is Wi-Fi. 
     
     
       7. The method of  claim 1  wherein the transmitting of the second set of OFDM symbols is based on a predetermined OFDM signal in one of a time domain and a frequency domain, the predetermined ODFM signal containing data associated with the second OFDM communication protocol. 
     
     
       8. The method of  claim 1  further comprising generating for transmission in the second set of OFDM symbols an OFDM signal in one of a time domain and a frequency domain, the OFDM signal being generated using a second plurality of subcarriers different from the base plurality of subcarriers, the second plurality of subcarriers having a second subcarrier frequency spacing defining the second symbol duration. 
     
     
       9. The method of  claim 8  wherein the OFDM signal generated is associated with the second OFDM communication protocol, the method further comprising interpolating the OFDM signal generated using the base plurality of subcarriers to produce an OFDM signal to form the second set of OFDM symbols. 
     
     
       10. The method of  claim 1  wherein the second set of OFDM symbols comprises control data associated with the second OFDM communication protocol, the control data being indicative of one of a transmission length, transmission time, transmission type and a channel reservation time associated with at least one of the first and second set of OFDM symbols. 
     
     
       11. The method of  claim 10  wherein the control data comprises one of Short Training Field (STF) data, Long Training Field (LTF) data, Signal Field (SIG) data. 
     
     
       12. The method of  claim 1  wherein the second set of OFDM symbols comprises packet data associated with the second OFDM communication protocol, the packet data being indicative of one of a transmission length, transmission time, transmission type and a channel reservation time associated with at least one of first and the second set of OFDM symbols. 
     
     
       13. The method of  claim 12  wherein the packet data comprises a Clear To Send (CTS) frame having a timer value indicative of a transmission end time associated with the at least one of the first and the second set of OFDM symbols. 
     
     
       14. The method of  claim 1  wherein the second set of OFDM symbols comprises an OFDM indication indicative of one of an OFDM type, OFDM mode and an OFDM parameter, a symbol duration, a CP duration, a number of subcarriers, a subcarrier spacing, a subcarrier modulation format, and a subcarrier frequency set associated with the first set of OFDM symbols. 
     
     
       15. An orthogonal frequency division multiplex (OFDM) Long Term Evolution(LTE) transmitter configured for transmission of a first set of OFDM symbols using a base plurality of subcarriers having a base subcarrier frequency spacing defining a base symbol duration, the OFDM transmitter comprising:
 circuitry containing instructions which, when executed, cause the transmitter to transmit, using the base plurality of subcarriers, a second set of OFDM symbols during one base symbol duration, each of the second set of OFDM symbols including a second Cyclic Prefix (CP) and having a second symbol duration smaller than the one base symbol duration, the first set of OFDM symbols being associated with a first radio access technology (RAT) having a first physical layer and the second set of OFDM symbols being associated with a second RAT having a second physical layer different from the first physical layer, the transmitting of the second set of OFDM symbols being based on a predetermined set of modulation values for the base plurality of subcarriers, the predetermined set of modulation values corresponding to data associated with the second RAT; and 
 the transmitting of the second set of OFDM signals including applying M Long Term Evolution (LTE) modulation values in the LTE transmitter to an M-point inverse fast Fourier transform (IFFT) to generate a Wi-Fi transmission recoverable at a Wi-Fi receiver by an N-point fast Fourier transform (FFT). 
 
     
     
       16. The OFDM transmitter of  claim 15  wherein the instructions are further configured to cause the transmitter to transmit, using the base plurality of subcarriers, a first set of OFDM symbols, each of the first set of OFDM symbols including a first CP and having a first symbol duration equal to the base symbol duration. 
     
     
       17. The OFDM transmitter of  claim 16  wherein the first and second sets of OFDM symbols are transmitted in sequence, as one of contiguous transmissions and non-contiguous transmissions. 
     
     
       18. The OFDM transmitter of  claim 17  wherein the first and second sets of OFDM symbols are transmitted as non-contiguous transmissions separated by a delay and wherein the second set of OFDM symbols comprises data is indicative of a time for completing transmission of the first set of OFDM symbols. 
     
     
       19. The OFDM transmitter of  claim 15  wherein the instructions are further configured to cause the transmitter to transmit, using the base plurality of subcarriers, a third set of OFDM symbols during one base symbol duration, each of the third set of OFDM symbols including a third CP and having a third symbol duration smaller than the base symbol duration. 
     
     
       20. The OFDM transmitter of  claim 15  wherein the first RAT is LTE and the second RAT is WiFi. 
     
     
       21. The OFDM transmitter of  claim 15  wherein the instructions are configured to cause the transmitter to transmit the second set of OFDM symbols based on a predetermined OFDM signal in one of a time domain and a frequency domain, the predetermined ODFM signal containing data associated with the second OFDM communication protocol. 
     
     
       22. The OFDM transmitter of  claim 15  wherein the instructions are further configured to cause the transmitter to generate for transmission in the second set of OFDM symbols an OFDM signal in one of a time domain and a frequency domain, the OFDM signal being generated using a second plurality of subcarriers different from the base plurality of subcarriers, the second plurality of subcarriers having a second subcarrier frequency spacing defining the second symbol duration. 
     
     
       23. The OFDM transmitter of  claim 22  wherein the OFDM signal generated is associated with the second OFDM communication protocol, and wherein the instructions are further configured to cause the transmitter to interpolate the OFDM signal generated using the base plurality of subcarriers to produce an OFDM signal to form the second set of OFDM symbols. 
     
     
       24. The OFDM transmitter of  claim 15  wherein the second set of OFDM symbols comprises control data associated with the first OFDM communication protocol, the control data being indicative of one of a transmission length, transmission time, transmission type and a channel reservation time associated with at least one of the first and second set of OFDM symbols. 
     
     
       25. The OFDM transmitter of  claim 24  wherein the control data comprises one of Short Training Field (STF) data, Long Training Field (LTF) data, Signal Field (SIG) data. 
     
     
       26. The OFDM transmitter of  claim 15  wherein the second set of OFDM symbols comprises packet data associated with the second OFDM communication protocol, the packet data being indicative of one of a transmission length, transmission time, transmission type and a channel reservation time associated with at least one of first and the second set of OFDM symbols. 
     
     
       27. The OFDM transmitter of  claim 26  wherein the packet data comprises a Clear To Send (CTS) frame having a timer value indicative of a transmission end time associated with the at least one of the first and the second set of OFDM symbols. 
     
     
       28. The OFDM transmitter of  claim 15  wherein the second set of OFDM symbols comprises an OFDM indication indicative of one of an OFDM type, OFDM mode and an OFDM parameter, a symbol duration, a CP duration, a number of subcarriers, a subcarrier spacing, a subcarrier modulation format, and a subcarrier frequency set associated with the first set of OFDM symbols.

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